The USGS conducted a 3D lidar[5] survey of the island to measure coastal change linked to Sandy, according to the agency.

Here are the (pretty technical) results:

[6]

Pelican Island and Fire Island (Source: U.S. Geological Survey)

[7]

Pelican Island and Fire Island (Source: U.S. Geological Survey)

[8]

This spot is near Old Inlet, a very narrow part of Fire island that was breached during Sandy, creating a new inlet, eroding the beach and cutting through 4-meter-high dunes. (Source: U.S. Geological Survey)

[9]

Ocean Bay Park, Fire Island, NY (Source: U.S. Geological Survey)

[10]

Ocean Bay Park, Fire Island, NY (Source: U.S. Geological Survey)

[11]

Sandy caused extensive erosion in Ocean Bay Park on Fire Island, removing sand from a 50-meter-wide swath of the beach and dunes, pushing sand inland and destroying or severely damaging many homes (Source: U.S. Geological Survey)